Burglar-alarm.



U. BUJGER.

BURGLAR ALARM.

APPLICATION FILED. 11.13, 1914.

1 1 1 3,306, 7 Patented Oct. 13, 1914.

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CIRIL BUJGER, OF ST. PAUL, MINNESOTA.

BURGLAR-ALARM.

Specification of Letters Patent. Application filed April 13, 1914.

Patented Oct.13, 1914. Serial 170,831,427.

To all whom it may concern I Be it known that I, GIRJL BUJGER, a subject of the Emperor of Austria-Hungary, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented a new and useful Improvement in Burglar- Alarms, of which the following is a specification.

The object of this invention is to provide an efficient and effective burglar alarm which can be easily and quickly adjusted for use. I I

release whereby through its movement'in one direction it is adapted to automatically cock the hammer.

s The invention further pertains to the de tails of construction employed whereby a simple, inexpensive and positively acting de-, vice is produced.

More particularly this invention relates to that class of burgler alarms in which an alarm is sounded by the explosion of a cap or cartridge.

In the accompanying drawing forming part of this specification, Figure 1 is a side elevation of my invention; Fig. 2 is another side elevation showing my invention applied to a door frame; Fig. 8 is an end view, and Fig. i is a perspective of the hammer.

In the drawing, A indicates a cartridge holding member in the form of a standard 2 having a base 3 and a socket 4, in which the cartridge 5 is placed. The base is provided with a screw 6 to fasten the device in position for use upon a door or window frame, a portion of said frame being illustrated and marked 7 in Fig. 2. Pivoted partway up the standard is a hammer B in,

the form of an arm 8 having a pair of laterally extending lugs 9, straddling the stand ard. The pivot 10 passes through said lugs and standard and forms a hingesupport for the hammer. The extremities of said lugs extend beyond the standard and carrya pin 11 to which one end of a helical spring 12 is attached. The opposite end of said spring is fastened to a hook 13 formed integral with the base 3. The free end of the hammer arm 8 is provided with a firing point 14: which is adapted to be swung down against the head of the cartridge 5 to fire the latter.

Fastened to the side of the standard above the pivot 10 is a hammer catch or trigger C, which is in the form of an arm pivoted by The improvement pertains to the manner of constructlng the hammer eatchhand the pin 15 to the side of the standard. This arm is shaped longitudinally in a reverse curve and is notched at 16 in one edge to engageIa catch pin 17 on the side of the hammer and releasablyhold the hammer in raised position. WVhen the catch arm is released from the catch pin 17, the hammer swings down against the cartridge. An edge 18 of the catch arm is curved to form a cam shoulder which is adapted to raise the hammer by engaging the pin 17 when the triggeris down and swinging the catcharm in the direction of the arrow indicated in Fig. 2 until the pin 17 engages in the notch 16. The free end of the catch arm extends sufficiently to form an elfective lever. for easily raising the hammer by hand against the tension of the spring 12. The shape of the arm also assists in forming the lever into a convenient handle, and presents a curved guiding surface 20 against which an object such as a door 21 illustrated by a de tail in Fig. 2 is adapted to swing and without any material resistance cause the catch arm to release the hammer and fire the cartridge. The parts illustrated in Fig. 1 illustrate the position assumed immediately after the cartridge has been fired.

In accordance with the patent statutes I have described-the principles of operation of my invention together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the construction shown is only illustrative and that the invention'can be carried out by other means and applied to uses other than those above set forth within the scope of the following claims.

Having described my invention, what I claim as new and desire to protect by Letters Patent is 1. In a burglar alarm adapted for use and associated with" two elements, one being movable and the other stationary, a standard having a holding socket for a cartridge and means of attachment for securing it to said stationary element, a cartridge adapted'to be held in said socket, a hammer hinged to said'standard and having a pointed free end, a catch pin on its side and a pairjof lateral extensions, a helical spring attached to the freeends'of said extensions and to a portion of said standard adapted to swing said hammer with its pointed end against said cartridge to fire it, and a catch arm pivoted by one end to said standard and formed with a cam surface extending longitudinally from said pivot connection and terminating in a notch, said cam surface be ing adapted as said catch arm is swung in one direction to engage the pin on said hammer and raise the hammer into retracted position, and said notch being adapted to engage said pin to hold said hammer in retracted position, the free end of said catch arm extending outwardly in the path of said movable member, whereby said movable member is adapted by its movement to disengage said catch arm from said catch pin on said hammer.

2. In a burglar alarm, a cartridge, a cartridge holding element, a hammer movably associated with said holding element, one of said elements having a catch shoulder, a spring associated with said holding element and hammer and adapted to cause said hammer to impinge against and fire said cartrid e, and a catch arm movably mounted upon the other of said elements and having a cam surface adapted when said arm is moved in one direction to cooperate. with and engage said catch shoulder and force said hammer and holding element apart against the tension of said spring to retract and releasably hold, in retracted position, one or" said elements from the other.

' In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

CIRIL BUJGER.

Witnesses:

STELLA L. WAsoHENBnneER, F. S. BRADBURY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. I 

